Joist-lifter.



.` SKA.

APPLlc Y 3. 191s.

1,220,034. Patented Mar. 20, 1917.

ls rum-s cul. rmmunuo.. wAsmncmN. n. c.

JAMES WASKA, CHICAGO, ILLINOIS.

J'OIST-LIFTER.

Specification of Letters Patent.

PatentedMar. 20, 1917.

Application filed July 3, 1916. Serial No. 107,236.

To all whom t may concern Be it known that I, JAMES VASKA, a citizen of the United States, residing at Chicago,'in the county of Cook and State of Illinois, have invented a certain new and useful Joist-Lifter, of which the following is a specification.

The object of this invention is to provide a simple and convenient device by means of which the end of a joist may be raised into proper position and temporarily held elevated until shims or other spacers may be placed beneath the endof the joist.

In the accompanying drawings, Figure 1 is a side elevational view of the lifter supporting a joist. Fig. 2 is an end view of the same. Fig. 3 is a top plan view thereof. Fig. 4 is a section taken on line 4-4 of Fig. 1.

In Fig. 1, the joist A is shown as raised by a lifter resting on the wall or foundation B. The lifter comprises a frame 1 with legs having feet 2 which rest upon the wall B. The frame 1 carries a stop pin 1a and the lifting and locking mechanisms and is adapted to straddle the joist to be set and rest upon the wall between the two adjacent joists. The arcuate member or segment 3 is supported by the trunnion 4 which is pivotally carried by a bearing 5 in the frame 1. A hand lever 6 is secured to the trunnion 4 and swings in a plane parallel to the frame and parallel to the plane in which the arcuate member is rocked. This construction enables the workman to stand upon the wall to operate the lifter when such a position is the most practical one.

Herein I have shown" the trunnionsecured to the hand lever and arcuate segment in the following manner: The trunnion 4 is integral at one end with the arcuate member but may be rigidly connected thereto in any suitable manner. The other end of the trunnion is squared, as indicated at 7 and is adapted to it a square hole in the hand lever 6. A washer 8 and cotter pin 9 are used as shown to detachably connect the lever to the trunnion. It will be understood, however, that any other suitable means may be used for permanently or detachably connecting the hand lever 6 to the arcuate segment 3 through the trunnion 4.

Near theperiphery of the arcuate segment and preferably on the extended center line of the hand lever is pivotally mounted a lifting bar 10. I have herein shown the pivot pin 11 carried by the arcuate member integral therewith, but it may be otherwise secured to the segment. The washer 12 and cotter pin 13 assist in pivotally securing one end of the bar 'to the pin in the manner described. To the other end of the bar l() is suitably secured, or integral therewith, a supporting hook 14 upon which the `ioist rests while being supported by the lifter.

The locking mechanism comprises a dog 15 pivoted in a recess 16 in the frame by a bolt 17 or other suitable means. The dog has a tooth 18 which is adapted to engage teeth 19 on the periphery of the arcuate member. If desired, the teeth 19 may be so spaced that the supporting hook will be given the same amount of vertical travel for the arcuate travel between any two adjacent teeth. The dog and tooth relation permits the arcuate member to advance in one direction and checks the movement in the opposite direction, as will be understood by referring to the drawing. The stop pin 1a iXes the extreme limit of return movement.

To raise a joist into level or horizontal position, the hook of the lifting bar lO-is inserted beneath the joist. The hand lever is then moved to rotate the arcuate member. This movement of the segment raises the bar which carries the j oist upward with it. The dog passes over each tooth on the segment as it passes beneath the dog. When the arcuate member is stopped, the dog` engages a tooth and the joist will be held in the position to which it was raised. A shingle, board or spacing block is then inserted between the end of the joist and the foundation B to hold the joist at the desired height. The hook 14 is then swung out from beneath thejoist.

I claim as my invention:

1. A joist lifter having, in combination, a frame having legs adapted to straddle a joist, an arcuate segment having teeth thereon and pivotally carried by the frame, a

lifting bar pivotally connected to said segment for supporting the joist, means for rocking said segment whereby said bar will be raised or lowered, and a dog on said frame adapted to engage said teeth and lock said lifting bar in any one of several positions.

2. A joist lifter having, in combination, a frame having legs adapted to straddle a joist, an arcuate segment having teeth on the periphery thereof and pivotally carried by 5 Said teeth and lock Said arcuate member.

3. A jost lifter having, in Combination, n frame lim/ing legs adapted 'to straelclle 2L joist7 an arcuate segment pivotally Carried by the frame, a lifting bar pivotally conneetecl to Said segment for supporting the 10 joist, means for rocking seid segment and eoperating means on said arcuate segment and said frame for locking the lifting bar in any one of several positions.

In testimony whereof, I have hereunto set 15 my hand.

JAMES VASKA.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C. 

